Meaning of “mental illness” in the English Dictionary

british dictionary

"mental illness" in British English

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mental illnessnoun [ C or U ]

uk /ˌmen.təl ˈɪl.nəs/ us /ˌmen.t̬əl ˈɪl.nəs/

an illness that affects the mind

(Definition of “mental illness” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)